A teenager has pleaded guilty to the machete murder of a young man who tried to defend his mother and girlfriend during a home invasion in south-west Sydney in 2010.

The 19-year-old, who cannot be named for legal reasons as he was a minor at the time, pleaded guilty in the NSW Supreme Court today.

Kesley Burgess, 25, was attacked by a gang of intruders who broke into his mother's Lurnea home wielding a machete and an axe.

Murdered ... Kesley Burgess. Photo: Channel Nine

He died in Liverpool Hospital the following day after suffering major blood loss from wounds to much of his body.

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Reports at the time said Mr Burgess, a security guard, pushed his girlfriend, Krysty and mother Tracy into a bedroom before he tried to fight off the attackers. His mother sustained a wound to her hand.